Hull speed

Nothing to see here folks, move on till at least July when the patents come into force. Meantime, there is much jargon to contend with.

 

conflict??????

 

re: paddle wheel steamer

Yes, the side wheelers were on the right track, insofar as they (almost) put the propulsion system in the right place (it's more or less in the correct place, but it's still a patch job and an open system).

Closing the system flow, at least asymptotically, is a more complicated endeavor than simply fitting a pair of paddle wheels. Note how messy the vessel's wake is.

Side wheelers also suffer from a fatal flaw: their ability to negotiate a coordinated turn is almost non-existent. The outboard wheel leaves the water when the vessel heels.

 

This thread promises to generate heat, though not much illumination !

 

I've done what I said I would in my earlier posts: I've set out my research in some detail. With that in mind, I'll be abandoning this thread for the time bein, at least until the next round of r&d is complete, and I have hard data to back up my claims.

I'll be back in touch in 6 moths or so.

 

Does this mean we will have to tootle around at "hull speed" for another 6 months at least ?

 

So lets see, it has all the advantages of a sidewheeler except it can't walk itself over a mudbank. That leaves, um, err, what?

Am I correct in guessing that your patent app doesn't cover catamarans because an existing patent is already in place there?

The idea of reducing wave drag by gobbling up the displaced water with the propulsion system is a seductive idea that has occurred to anybody that has had an intro hydro course. There are patents for propulsion gadgets operating in the space between cat hulls that claim to handle the hull interference issue. These at least can operate in a locally slowed flow and gain propulsion efficiency. You are suggesting operating in an accelerated flow in order to limit the extent of the free stream disturbance. All you are really doing is applying additional power to flatten the wake. You don't get it back. Not all of it. If you like math, there is an interesting exercise where you assume the hull permeable. You can solve for shapes and permeabilities that have no wave drag. Some cases are analytic.

http://www.newscientist.com/article...lp-submarines-leave-no-wake.html#.UxyH0D9dWa8

 

An asymptote is a value that a function can't reach. By definition is a discontinuity, therefore open. How can you be "asymptotically" (please explain and define) and closed?

 

re: asymptotic closure

Insofar as an asymptote is a limit, it is also useful in defining a "fuzzy" system. At the limits of the flow of the system, it does not matter if some of the flow escapes the system as long as other flow replaces it. All that matters is that the continuity equations are close. At this point the flow model becomes statistical in nature, as it must. The equations do not have to be exact.

 

Thank God this isn't a FIGJAM thread. Much.

 

Hahahaha...not seen that 'word' for ages

 

If flow escapes, then the system is not closed. Is it either closed or open. Also, the limit of a function can be an asymptote. However, if it is horizontal it is a numerical value, if vertical it is infinite. Which are you referring to and what do you mean by it?

 

asymptotic limits

You're missing the context of the system description: The system under consideration is neither open nor entirely closed. Part of it is closed, part of it is open and both part physically constrained and part dynamically constrained. The system boundary of the part of the system that is dynamically constrained includes attached flow. The system asymptote to which I refer is somewhere in the boundary between attached flow and flow outside the system. The exact location of same, as well as its variation, are unimportant so long as system flow is effectively closed. The mathematics that describe the flow are both statistical and mathematically chaotic.

Chaos theory, insofar as it is usually applied to fluid dynamic problems, is commonly used to explain why a system collapses into turbulence. However (this is much less common) it can also be used to predict the onset of turbulence and, if used correctly, prevent its formation. I have accomplished this in related research.

In statistical terms, it does not matter which individual molecules of water, salt and other substances located at or near the system boundary transit the closed part of the system. What matters is that the entire system, including attached flow, is sufficiently well organized enough that the system may be treated as a closed system. In other words, 99% is good enough. The system asymptote may be viewed as the 100% limit.

 

I am thinking of submitting some unsubstantiated new (or old) idea for consideration just because I enjoy the replies of our resident experts so much. Great entertainment.

 

Like Sgt Schultz, I saw nussink !